JP2000021453A - Nonaqueous electrolyte secondary battery - Google Patents
Nonaqueous electrolyte secondary batteryInfo
- Publication number
- JP2000021453A JP2000021453A JP10187887A JP18788798A JP2000021453A JP 2000021453 A JP2000021453 A JP 2000021453A JP 10187887 A JP10187887 A JP 10187887A JP 18788798 A JP18788798 A JP 18788798A JP 2000021453 A JP2000021453 A JP 2000021453A
- Authority
- JP
- Japan
- Prior art keywords
- positive electrode
- negative electrode
- electrode plate
- active material
- secondary battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、小型化された電
子機器等で使用される非水電解質二次電池に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-aqueous electrolyte secondary battery used in miniaturized electronic equipment and the like.
【０００２】[0002]
【従来の技術】近年、電子機器の小型化および携帯化が
急速に進展している。そして、この種の電子機器におい
て、電源として使用される二次電池には、小型で高エネ
ルギー密度を有することが要求される。このため、現在
では、多種多様な二次電池が研究開発され、実用化され
ている。このような二次電池の中に、図５に示したよう
な非水電解質二次電池１がある。2. Description of the Related Art In recent years, miniaturization and portability of electronic devices have been rapidly progressing. In this type of electronic device, a secondary battery used as a power source is required to be small and have a high energy density. For this reason, various types of secondary batteries are currently being researched, developed, and put into practical use. Among such secondary batteries, there is a non-aqueous electrolyte secondary battery 1 as shown in FIG.
【０００３】この非水電解質二次電池１は、まず、帯状
の負極板２と帯状の正極板３の間に薄板状のセパレータ
４ａを挟み込み、さらに正極板３の開放側面に他のセパ
レータ４ｂを密着させる。ついで、上記で得られた積層
極板を渦巻き状に巻回して電極５を形成し、この電極５
を円筒状の負極缶６内に装填する。In this nonaqueous electrolyte secondary battery 1, first, a thin plate-shaped separator 4 a is sandwiched between a strip-shaped negative electrode plate 2 and a strip-shaped positive electrode plate 3, and another separator 4 b is placed on the open side surface of the positive electrode plate 3. Adhere. Next, the laminated electrode plate obtained above is spirally wound to form an electrode 5.
Is loaded into the cylindrical negative electrode can 6.
【０００４】つぎに、負極缶６の開口部をキャップ７で
閉塞する。そして、負極板２の外周側下端部と負極缶６
の底部をリード線８で接続し、正極板３の内周側上端部
とキャップ７側をリード線９で接続して構成されてい
る。Next, the opening of the negative electrode can 6 is closed with a cap 7. Then, the lower end portion on the outer peripheral side of the negative electrode plate 2 and the negative electrode can 6
Of the positive electrode plate 3 and the cap 7 side are connected with a lead wire 9.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記の
ような非水電解質二次電池１では、負極板２の外周側下
端部と正極板３の内周側上端部にそれぞれ電流を取り出
すためのリード線８，９が設けられているが、その取り
付け位置が一カ所である。また、負極板２や正極板３に
含まれる集電体が電気抵抗を持っている。集電体には金
属が使用されるが、定められた容器にできるだけ多くの
活物質を詰め込んで容量を上げるために、非常に薄い箔
が使用されている。したがって、電気抵抗はかなり大き
くなっている。しかし、そこに塗工された電極材料はさ
らに抵抗が大きく、電極板の長さ方 向の抵抗減少にほと
んど寄与しない。However, in the nonaqueous electrolyte secondary battery 1 as described above, the leads for extracting current are respectively provided at the lower end on the outer peripheral side of the negative electrode plate 2 and the upper end on the inner peripheral side of the positive electrode plate 3. Lines 8 and 9 are provided, but the mounting position is one place. Further, the current collector included in the negative electrode plate 2 and the positive electrode plate 3 has electric resistance. Metal is used for the current collector, but a very thin foil is used in order to fill a predetermined container with as much active material as possible to increase the capacity. Therefore, the electric resistance is considerably large. However, there the electrode material that is coated has a large further resistance, contributes little to the resistance reduction of the length Direction of the electrode plate.
【０００６】このため、充放電時には、電極長さ方向
（負極板２および正極板３の渦巻きに沿った方向）に電
位勾配が生じ、負極板２や正極板３におけるリード線
８，９の取り付け位置から遠い部分では、電池反応速度
が低下することになる。その結果、電池反応が不均一に
なり、電池の体積または重量エネルギー密度が小さくな
ってしまうという問題があった。また、リード線の数を
増やすと、その取り付け面積分、電極活物質の塗工面積
が減少し容量が低下する。Therefore, during charging and discharging, a potential gradient is generated in the electrode length direction (the direction along the spiral of the negative electrode plate 2 and the positive electrode plate 3), and the lead wires 8 and 9 are attached to the negative electrode plate 2 and the positive electrode plate 3. In a portion far from the position, the battery reaction speed decreases. As a result, there is a problem that the battery reaction becomes non-uniform and the volume or the weight energy density of the battery becomes small. In addition, when the number of lead wires is increased, the application area of the electrode active material is reduced by the mounting area, and the capacity is reduced.
【０００７】この発明は、このような事情に鑑みなされ
たもので、電極におけるリード線から遠い部分で電池反
応が遅れても、電池反応が均一になるようにすることに
より電池の単位充放電容量を向上させ得る非水電解質二
次電池の提供をその目的とする。すなわち、本発明の発
明者は、容量が理論値に達しない理由を検討し、リード
線からの距離により生じる電位差に基づいて、充放電反
応に不均一が生じるためではないかと思い至り本発明に
達した。なお、後述する実施例から判るように、本発明
により容量が増加した。これは充放電反応が後述する比
較例よりも均一になったためと解釈できる。The present invention has been made in view of such circumstances, and even if the battery reaction is delayed in a portion of the electrode far from the lead wire, the battery response is made uniform so that the unit charge / discharge capacity of the battery is improved. It is an object of the present invention to provide a non-aqueous electrolyte secondary battery capable of improving the performance. That is, the inventor of the present invention examined the reason why the capacity did not reach the theoretical value, and based on the potential difference caused by the distance from the lead wire, thought that the charge / discharge reaction might be non-uniform, and came to the present invention. Reached. As can be seen from the examples described later, the capacity was increased by the present invention. This can be interpreted as the charge / discharge reaction became more uniform than in the comparative example described later.
【０００８】[0008]
【課題を解決するための手段】上記の目的を達成するた
め、この発明の請求項１に係る非水電解質二次電池は、
帯状の正極集電体の両面に正極活物質層を形成した正極
板と帯状の負極集電体の両面に負極活物質層を形成した
負極板の間にそれぞれセパレータを挟んだ状態で渦巻き
状に巻回して電極を形成し、この電極を缶内に装填し、
上記正極板から正極リードを、上記負極板から負極リー
ドを、それぞれ上記缶の外表面に連通するように延設し
た非水電解質二次電池であって、少なくとも、上記正極
板の正極活物質層の厚みが、正極リードの取り付け位置
から遠ざかるに従い薄くなるようにしたという構成をと
る。In order to achieve the above object, a non-aqueous electrolyte secondary battery according to claim 1 of the present invention comprises:
It is spirally wound with a separator sandwiched between a positive electrode plate having a positive electrode active material layer formed on both sides of a belt-shaped positive electrode current collector and a negative electrode plate having a negative electrode active material layer formed on both surfaces of a band-shaped negative electrode current collector. To form an electrode, load this electrode into a can,
A nonaqueous electrolyte secondary battery extending from the positive electrode plate to the positive electrode lead and from the negative electrode plate to the negative electrode lead so as to communicate with the outer surface of the can, respectively, at least the positive electrode active material layer of the positive electrode plate Is made thinner as it goes away from the mounting position of the positive electrode lead.
【０００９】すなわち、この非水電解質二次電池でも、
電極長さ方向に電位勾配が生じることは、従来例と同様
であるが、この非水電解質二次電池では、正極板におけ
る正極活物質層が正極リードから遠くなるにしたがって
薄くなるようにしている。したがって、正極活物質層内
でのイオンの移動時間が短くなる。That is, in this non-aqueous electrolyte secondary battery,
The occurrence of a potential gradient in the electrode length direction is the same as in the conventional example, but in this nonaqueous electrolyte secondary battery, the positive electrode active material layer in the positive electrode plate is made thinner as the distance from the positive electrode lead increases. . Therefore, the movement time of ions in the positive electrode active material layer is shortened.
【００１０】このため、正極リードから遠い部分で反応
速度が遅くなっても、正極活物質層の厚みの厚い正極リ
ードの近くの部分と同じくらいの反応が得られるように
なる。その結果、見かけ上の反応速度は正極板のどの部
分でも一定になり、電池の単位充放電容量が大きくする
ことができるようになる。Therefore, even if the reaction rate is slow in a portion far from the positive electrode lead, the same reaction can be obtained as in a portion near the positive electrode lead having a thick positive electrode active material layer. As a result, the apparent reaction rate becomes constant in any part of the positive electrode plate, and the unit charge / discharge capacity of the battery can be increased.
【００１１】また、請求項２に係る発明では、さらに、
負極板の表面においても、負極リードの取り付け位置か
ら遠ざかるに従い負極活物質層の厚みが薄くなるように
している。このように、正極板だけでなく、負極板の負
極活物質層の厚みにもテーパを設けることにより、さら
に、電池の単位充放電容量が大きくすることができるよ
うになる。[0011] In the invention according to claim 2,
Also on the surface of the negative electrode plate, the thickness of the negative electrode active material layer is set to decrease as the distance from the mounting position of the negative electrode lead increases. As described above, by providing a taper not only in the positive electrode plate but also in the thickness of the negative electrode active material layer of the negative electrode plate, the unit charge / discharge capacity of the battery can be further increased.
【００１２】さらに、請求項３にかかる発明では、負極
リードの取り付け位置から遠ざかるに従い負極活物質層
の厚みが薄くなるようになった負極板および正極板にお
ける厚みの薄い方が渦巻き状の円心側に位置するように
している。Further, in the third aspect of the present invention, the negative electrode plate and the positive electrode plate, each having a smaller thickness as the distance from the mounting position of the negative electrode lead is reduced, the thinner the negative electrode plate and the positive electrode plate, the smaller the spiral center. It is located on the side.
【００１３】すなわち、一般的に、非水電解質二次電池
における渦巻き状に巻回された電極の中心部の中空部分
の直径は、通常３〜５mm程度である。このような小径部
分に電極を巻き取ろうとすれば、電極活物質層にひび割
れを生じたり、負極板または正極板とセパレータの密着
が不均一になる。その結果、電池に異常反応が生じて、
電極の劣化すなわちサイクル劣化を起こすようになる。That is, generally, the diameter of the hollow portion at the center of the spirally wound electrode in the nonaqueous electrolyte secondary battery is usually about 3 to 5 mm. If an attempt is made to wind the electrode around such a small-diameter portion, the electrode active material layer may be cracked, or the adhesion between the negative electrode plate or the positive electrode plate and the separator may be non-uniform. As a result, an abnormal reaction occurs in the battery,
Electrode deterioration, that is, cycle deterioration occurs.
【００１４】このため、この発明では、負極活物質層の
厚みにテーパが設けられた負極板の場合には、その薄い
方、および正極板の薄い方を電極における中心側に位置
させて、無理なく電極を巻き取ることができるようにし
ている。これによって、電池反応がより均一に起こるよ
うになりサイクル劣化が生じにくくなる。つぎに、この
発明による実施の態様を図面を用いて詳しく説明する。For this reason, in the present invention, in the case of a negative electrode plate having a tapered negative electrode active material layer, the thinner one and the thinner one of the positive electrode plates are positioned at the center side of the electrode, thereby making it impossible. The electrode can be wound up without the need. As a result, the battery reaction occurs more uniformly, and cycle deterioration hardly occurs. Next, embodiments of the present invention will be described in detail with reference to the drawings.
【００１５】[0015]
【発明の実施の形態】図１および図２は、この発明の一
例による非水電解質二次電池１０を示している。この非
水電解質二次電池１０で使用される正極板１１は、加工
前には、図３に示すようになっている。すなわち、この
正極板１１では、アルミ箔からなる帯状の正極集電体１
２の両面に、一端側を残して正極活物質層１３が形成さ
れている。この正極活物質層１３はともに一端側の厚み
が厚く形成され、他端側にいくほどその厚みが徐々に薄
くなっている。1 and 2 show a non-aqueous electrolyte secondary battery 10 according to one embodiment of the present invention. The positive electrode plate 11 used in the non-aqueous electrolyte secondary battery 10 is as shown in FIG. 3 before processing. That is, in the positive electrode plate 11, the strip-shaped positive electrode current collector 1 made of aluminum foil is used.
The positive electrode active material layer 13 is formed on both sides of the second electrode 2 except for one end. The positive electrode active material layer 13 is formed such that the thickness at one end is thicker, and the thickness gradually decreases toward the other end.
【００１６】そして、正極集電体１２の一端にはアルミ
製の正極リード１４の一端が固定されその他端は上方に
向かって延びている。上記正極集電体１２の厚みは２０
μｍに設定され、正極リード１４の厚みは１００μｍに
設定されている。One end of the positive electrode current collector 12 is fixed to one end of an aluminum positive electrode lead 14 and the other end is extended upward. The thickness of the positive electrode current collector 12 is 20
The thickness of the positive electrode lead 14 is set to 100 μm.
【００１７】また、正極活物質層１３は、リチウムコバ
ルト複合酸化物，黒鉛粉末，ポリフッ化ビニリデンおよ
びＮ−メチルピロリドンの混合物からなり、この混合物
を、正極集電体１２の両面にコーティングし、乾燥させ
たのち圧延して形成されている。The positive electrode active material layer 13 is composed of a mixture of a lithium cobalt composite oxide, graphite powder, polyvinylidene fluoride and N-methylpyrrolidone. This mixture is coated on both surfaces of the positive electrode current collector 12 and dried. After being rolled, it is formed.
【００１８】負極板１５は、図４に示すように、銅箔か
らなる帯状の負極集電体１６の両面に、一端側を残して
負極活物質層１７が形成されている。この負極活物質層
１７も正極活物質層１３と同様一端側の厚みが厚く形成
され、他端側にいくほどその厚みが徐々に薄くなってい
る。その比率は、他端側の厚みが一端側の厚みの５０〜
９５％に設定され、好ましくは、７５〜９０％に設定す
ることである。そして、その形状は、直線的に薄くして
いくだけでなく、上側または下側に湾曲するような曲線
状にして徐々に薄くしてもよい。As shown in FIG. 4, the negative electrode plate 15 has a negative electrode active material layer 17 formed on both sides of a strip-shaped negative electrode current collector 16 made of copper foil, except for one end. Like the positive electrode active material layer 13, the negative electrode active material layer 17 is formed to have a large thickness at one end, and the thickness gradually decreases toward the other end. The ratio is such that the thickness at the other end is 50 to 50 times the thickness at the one end.
It is set to 95%, preferably to 75 to 90%. The shape may be not only linearly reduced, but also gradually reduced in a curved shape curved upward or downward.
【００１９】そして、負極集電体１６の一端にはニッケ
ル製の負極リード１８の一端が固定されその他端は下方
に向かって延びている。上記負極集電体１６の厚みは１
０μｍに設定され、負極リード１８の厚みは１００μｍ
に設定されている。An end of a negative electrode lead 18 made of nickel is fixed to one end of the negative electrode current collector 16 and the other end extends downward. The thickness of the negative electrode current collector 16 is 1
0 μm, and the thickness of the negative electrode lead 18 is 100 μm
Is set to
【００２０】また、負極活物質層１７は、黒鉛粉末，ポ
リフッ化ビニリデンおよびＮ−メチルピロリドンの混合
物を、負極集電体１６の両面にコーティングし、乾燥さ
せたのち圧延して形成されている。The negative electrode active material layer 17 is formed by coating a mixture of graphite powder, polyvinylidene fluoride and N-methylpyrrolidone on both surfaces of the negative electrode current collector 16, drying and rolling the mixture.
【００２１】このように構成された正極板１１と負極板
１５を用いて、非水電解質二次電池１０は次のようにし
て得られる。まず、正極板１１と負極板１５の間に、ポ
リプロピレン製の薄板帯状のセパレータ１９ａを密着し
た状態で配設するとともに、さらに正極板１１の開放側
面に他のセパレータ１９ｂを密着させる。ついで、この
積層体を負極板１５が外側になるようにして薄肉側から
順次渦巻き状に巻回して電極２０を形成し、この電極２
０を円筒状の負極缶２１内に装填する。Using the positive electrode plate 11 and the negative electrode plate 15 configured as described above, a non-aqueous electrolyte secondary battery 10 is obtained as follows. First, a thin strip-shaped separator 19a made of polypropylene is disposed between the positive electrode plate 11 and the negative electrode plate 15 in close contact, and another separator 19b is further adhered to the open side surface of the positive electrode plate 11. Next, the laminated body is sequentially spirally wound from the thinner side so that the negative electrode plate 15 is on the outside, to form an electrode 20.
0 is loaded into the cylindrical negative electrode can 21.
【００２２】つぎに、負極缶２１の開口部に破裂板２２
とキャップ２３を配設し、その外周部をパッキング２４
を介して負極缶２１の上端縁周部でかしめることによっ
て、負極缶２１の開口部を閉塞する。この際、負極板１
５の負極リード１８の他端部が負極缶２１の底部に接続
され、正極板１１の正極リード１４の他端が破裂板１１
を介してキャップ２３に接続されるようにしておく。Next, a rupturable plate 22 is provided in the opening of the negative electrode can 21.
And a cap 23, and the outer periphery thereof is
The opening of the negative electrode can 21 is closed by caulking at the peripheral edge of the upper end of the negative electrode can 21. At this time, the negative electrode plate 1
5 is connected to the bottom of the negative electrode can 21, and the other end of the positive electrode lead 14 of the positive electrode plate 11 is connected to the rupture plate 11.
Through the cap 23.
【００２３】また、負極缶２１内における空間部には、
エチレンカーボネイトとジエチルカーボネイトの混合溶
媒に、六フッ化リン酸リチウムをとかした電解液２５が
充填されている。これによって、非水電解質二次電池１
０が得られる。In the space inside the negative electrode can 21,
An electrolytic solution 25 containing lithium hexafluorophosphate is filled in a mixed solvent of ethylene carbonate and diethyl carbonate. Thereby, the non-aqueous electrolyte secondary battery 1
0 is obtained.
【００２４】この非水電解質二次電池１０は、渦巻き状
の電極２０を構成する層が円心部分に近いほど薄く、外
周部分に近いほど厚くなっている。そして、正極リード
１４および負極リード１８がともに正極板１１，負極板
１５の外周側端部から延設されるようになっている。In the non-aqueous electrolyte secondary battery 10, the layer constituting the spiral electrode 20 is thinner as it approaches the center of the circle and thicker as it approaches the outer periphery. Both the positive electrode lead 14 and the negative electrode lead 18 extend from the outer peripheral end of the positive electrode plate 11 and the negative electrode plate 15.
【００２５】このような構成になっているため、この非
水電解質二次電池１０は、充放電時に正極板１１の長さ
方向で生じる電位勾配により正極リード１４から遠い部
分で反応速度が遅くなっても、正極板１１における正極
リード１４の近くの厚みの厚い部分と同じくらいの反応
が得られるようになる。その結果、見かけ上の反応速度
は正極板１１のどの部分でも一定になり、電池の単位充
放電容量を向上させることができるようになる。With this configuration, the reaction rate of the non-aqueous electrolyte secondary battery 10 is slow in a portion far from the positive electrode lead 14 due to a potential gradient generated in the length direction of the positive electrode plate 11 during charging and discharging. However, the same reaction can be obtained as in the thick portion near the positive electrode lead 14 in the positive electrode plate 11. As a result, the apparent reaction rate becomes constant in any part of the positive electrode plate 11, and the unit charge / discharge capacity of the battery can be improved.
【００２６】さらに、負極板１５の表面においても、負
極リード１８の取り付け位置から遠ざかるに従い負極活
物質層１７の厚みが薄くなるようにしている。このよう
に、正極板１１だけでなく、負極板１５の負極活物質層
１７の厚みも負極リード１８から遠ざかる部分ほど薄く
なるようなテーパを設けることにより、さらに、効率よ
く電池の単位充放電容量を向上させることができるよう
になる。Further, also on the surface of the negative electrode plate 15, the thickness of the negative electrode active material layer 17 decreases as the distance from the mounting position of the negative electrode lead 18 increases. As described above, by providing the taper such that the thickness of the negative electrode active material layer 17 of the negative electrode plate 15 as well as the thickness of the negative electrode plate 15 becomes thinner as the distance from the negative electrode lead 18 increases, the unit charge / discharge capacity of the battery can be further efficiently increased. Can be improved.
【００２７】また、正極板１１および負極板１５におけ
る厚みの薄い方が渦巻き状の円心側に位置するようにし
ているため、正極板１１および負極板１５等からなる積
層体を巻回する際、正電極活物質層１３および負極活物
質層１７にひび割れが生じることを防止することができ
るようになる。また、正極板１１または負極板１５とセ
パレータ１９ａ，１９ｂの密着が不均一になることも防
止できるようになる。Further, since the thinner one of the positive electrode plate 11 and the negative electrode plate 15 is located on the side of the spiral center of the spiral, when the laminated body including the positive electrode plate 11 and the negative electrode plate 15 is wound, Thus, it is possible to prevent the positive electrode active material layer 13 and the negative electrode active material layer 17 from cracking. In addition, non-uniform adhesion between the positive electrode plate 11 or the negative electrode plate 15 and the separators 19a and 19b can be prevented.
【００２８】その結果、この非水電解質二次電池１０で
は、無理なく電極２０を巻き取ることができるようにな
り、これによって、電池反応がより均一に起こるように
なり電池の異常反応を防止でき、サイクル劣化が生じに
くくなる。As a result, in the non-aqueous electrolyte secondary battery 10, the electrode 20 can be wound up without difficulty, whereby the battery reaction occurs more uniformly and the abnormal reaction of the battery can be prevented. Cycle degradation is less likely to occur.
【００２９】なお、上記の例では、正極板１１，負極板
１５ともに他端側を薄肉に形成しているが、この発明は
これに限定するものではなく、少なくとも正極板１１が
上記のように構成されていれば、負極板１５は全体を均
一な厚みにしてもよい。In the above example, the other ends of both the positive electrode plate 11 and the negative electrode plate 15 are formed to be thin. However, the present invention is not limited to this, and at least the positive electrode plate 11 is formed as described above. If constituted, the negative electrode plate 15 may have a uniform thickness as a whole.
【００３０】また、電極２０の円心側に正極板１１，負
極板１５の厚肉側が位置するようにしてもよい、要は、
正極板１１及び負極板１５の一端厚肉側に正極リード１
４，負極リード１８が取り付けられていればよい。した
がって、正極板，負極板の中心部分を厚肉に形成し、両
端側をそれぞれ薄肉に形成することもできる。この場
合、正極リード，負極リードは、それぞれ、正極板，負
極板の中心部分に取り付けられる。Further, the thick sides of the positive electrode plate 11 and the negative electrode plate 15 may be located on the center of the electrode 20.
One end of the positive electrode plate 11 and the negative electrode plate 15 has a positive electrode lead 1
4. It is sufficient that the negative electrode lead 18 is attached. Therefore, the central portions of the positive electrode plate and the negative electrode plate can be formed to be thick, and both ends can be formed to be thin. In this case, the positive electrode lead and the negative electrode lead are attached to the central portions of the positive electrode plate and the negative electrode plate, respectively.
【００３１】また、上記の例では、負極缶２１が円筒状
になって非水電解質二次電池の全体形状が円柱状になっ
ているが、非水電解質二次電池の形状は、このような形
状に限らず、横断面形状が四角形や六角形の角型やガム
型であっても良いことは言うまでもない。また、この発
明の実施例を比較例と比較して試験を行った。その結果
を以下に記す。In the above example, the negative electrode can 21 is cylindrical and the entire shape of the non-aqueous electrolyte secondary battery is cylindrical, but the shape of the non-aqueous electrolyte secondary battery is It goes without saying that the cross-sectional shape is not limited to the shape, and the cross-sectional shape may be a square or hexagonal square or gum type. Further, a test was conducted by comparing the example of the present invention with a comparative example. The results are described below.
【００３２】[0032]
【実施例】正極板１１は、集電体となる厚み２０μｍの
アルミ箔の両面に、リチウムコバルト複合酸化物９０重
量部，黒鉛粉末５重量部，ポリフッ化ビニリデン樹脂５
重量部、および、溶媒となるＮ−メチルピロリドン４５
重量部の混合物を塗布した後、乾燥、圧延することによ
り製作した。DESCRIPTION OF THE PREFERRED EMBODIMENTS A positive electrode plate 11 is composed of a 20 .mu.m-thick aluminum foil serving as a current collector, on both sides of which 90 parts by weight of lithium cobalt composite oxide, 5 parts by weight of graphite powder, and 5 parts by weight of polyvinylidene fluoride resin.
Parts by weight and N-methylpyrrolidone 45 as a solvent
It was manufactured by applying a mixture of parts by weight, drying and rolling.
【００３３】つぎに、正極集電体１２の一端に、厚さ１
００μｍ、幅４mmのアルミ製の正極リード１４を溶接し
た。なお、製作した正極単位面積当たりのリチウムコバ
ルト複合酸化物の塗布量は、リード溶接端で４２mg／cm
２、他端で３６mg／cm２となるように直線的に変化させ
た。また、電極の大きさは、幅３８mm、長さ４５cmとし
た。Next, one end of the positive electrode current collector 12 is
An aluminum positive electrode lead 14 having a thickness of 00 μm and a width of 4 mm was welded. The applied amount of the manufactured lithium cobalt composite oxide per unit area of the positive electrode was 42 mg / cm at the welded end of the lead.
2 , and linearly changed to 36 mg / cm 2 at the other end. The size of the electrode was 38 mm in width and 45 cm in length.
【００３４】負極板１５は、集電体となる厚さ１０μｍ
の銅箔の両面に、黒鉛粉末９０重量部、ポリフッ化ビニ
リデン１０重量部、および、溶媒となるＮ−メチルピロ
リドン５０重量部の混合物を、塗布した後、乾燥、圧延
することにより製作した。The negative electrode plate 15 has a thickness of 10 μm serving as a current collector.
A mixture of 90 parts by weight of graphite powder, 10 parts by weight of polyvinylidene fluoride, and 50 parts by weight of N-methylpyrrolidone as a solvent was applied to both surfaces of the copper foil, and then dried and rolled.
【００３５】つぎに、負極集電体１６の一端に、厚さ１
００μｍ、幅５mmのニッケル製の負極リード１８を溶接
した。なお、作製した負極単位面積当たりの黒鉛粉末塗
布量は、リード溶接端で２２mg／cm２、他端で１８mg／
cm２となるように直線的に変化させた。また、電極の大
きさは、幅３８mm、長さ４６cmとした。Next, one end of the negative electrode current collector 16 is
A nickel negative electrode lead 18 of 00 μm and 5 mm width was welded. The applied amount of graphite powder per unit area of the prepared negative electrode was 22 mg / cm 2 at the lead welding end and 18 mg / cm 2 at the other end.
It was changed linearly so as to be cm 2 . The size of the electrode was 38 mm in width and 46 cm in length.
【００３６】つぎに、正極板１１と負極板１５を、リー
ド１４，１８が溶接されていない側を中心に巻き取り、
電極ロールを製作した。なお、正極板１１と負極板１５
の間にはセパレータ１９ａ，１９ｂとなる厚さ３０μｍ
のポリプロピレン製多孔質膜を配設した。こうして製作
した電極ロールを、内径１６mm、深さ４８mmの円筒型負
極缶２１に挿入し、負極リード１８と負極缶２１の底部
とを溶接した。つぎに、正極リード１４とキャップ２３
とを溶接した。Next, the positive electrode plate 11 and the negative electrode plate 15 are wound around the side where the leads 14 and 18 are not welded.
An electrode roll was made. The positive electrode plate 11 and the negative electrode plate 15
30 μm in thickness between separators 19a and 19b
Was provided. The electrode roll thus manufactured was inserted into a cylindrical negative electrode can 21 having an inner diameter of 16 mm and a depth of 48 mm, and the negative electrode lead 18 and the bottom of the negative electrode can 21 were welded. Next, the positive electrode lead 14 and the cap 23
And was welded.
【００３７】さらに、正極板１１、負極板１５およびセ
パレータ１９ａ，１９ｂに、電解液を含浸させた。電解
液としては、エチレンカーボネートとジエチルカーボネ
ートとを体積比で３：７に混合した物に、六フッ化リン
酸リチウムを１．２mol/Ｌの濃度で溶解させた物を使用
した。最後に負極缶２１の開放部をかしめることにより
負極缶２１を密閉し、非水電解質二次電池１０を作製し
た。Further, the positive electrode plate 11, the negative electrode plate 15, and the separators 19a and 19b were impregnated with an electrolytic solution. As the electrolytic solution, a material obtained by dissolving lithium hexafluorophosphate at a concentration of 1.2 mol / L in a mixture of ethylene carbonate and diethyl carbonate at a volume ratio of 3: 7 was used. Finally, the negative electrode can 21 was hermetically closed by caulking the open portion of the negative electrode can 21, thereby producing the nonaqueous electrolyte secondary battery 10.
【００３８】こうして作製した非水電解質二次電池１０
のサイクル特性試験を行った。サイクル特性試験は、作
製した電池を、２５℃に設定された恒温器中にセット
し、１Ａの電流で繰り返し充放電を行い、その放電容量
変化を測定することにより行った。The non-aqueous electrolyte secondary battery 10 thus manufactured
Was subjected to a cycle characteristic test. The cycle characteristic test was performed by setting the prepared battery in a thermostat set at 25 ° C., repeatedly charging and discharging with a current of 1 A, and measuring a change in the discharge capacity.
【００３９】[0039]
【比較例１】正極単位面積当たりのリチウムコバルト複
合物の塗布量を、リード溶接端、他端ともに、３９mg／
cm２となるようにし、負極単位面積当たりの黒鉛粉末塗
布量を、リード溶接端、他端ともに２０mg／cm２となる
ようにした以外は、上記実施例と同様の方法により、非
水電解質二次電池を製作し、サイクル特性試験を行っ
た。Comparative Example 1 The coating amount of the lithium cobalt composite per unit area of the positive electrode was 39 mg /
cm 2, and the amount of graphite powder applied per unit area of the negative electrode was set to 20 mg / cm 2 for both the lead welded end and the other end, in the same manner as in the above example. A secondary battery was manufactured, and a cycle characteristic test was performed.
【００４０】[0040]
【比較例２】正極単位面積当たりのリチウムコバルト複
合物の塗布量を、リード溶接端、他端ともに、３９mg／
cm２となるようにし、負極単位面積当たりの黒鉛粉末塗
布量を、リード溶接端で３６mg／cm２、他端で４mg／cm
２となるようにした以外は、上記実施例と同様の方法に
より、非水電解質二次電池を製作し、サイクル特性試験
を行った。Comparative Example 2 The amount of the lithium cobalt composite applied per unit area of the positive electrode was 39 mg /
cm 2, and the amount of graphite powder applied per unit area of the negative electrode was 36 mg / cm 2 at the lead welding end and 4 mg / cm 2 at the other end.
A non-aqueous electrolyte secondary battery was manufactured and subjected to a cycle characteristic test in the same manner as in the above example except that the value was changed to 2 .
【００４１】上記実施例、比較例１および比較例２にお
いて行ったサイクル特性試験の結果を別紙の表１に示
す。Table 1 shows the results of the cycle characteristic tests performed in the above Examples, Comparative Examples 1 and 2.
【００４２】[0042]
【表１】 [Table 1]
【００４３】なお、表１における容量保持率とは、ｎサ
イクル目の放電容量を初回放電容量で除した値である。
この表１から明らかなように、実施例の電池は、比較例
の電池と比較して、初回放電容量が高く、サイクル劣化
も小さい、特に、１００サイクル目から５００サイクル
目へのサイクル劣化は、比較例の電池に比べて極めて小
さくなっている。The capacity retention in Table 1 is a value obtained by dividing the discharge capacity at the nth cycle by the initial discharge capacity.
As is clear from Table 1, the batteries of Examples have a higher initial discharge capacity and smaller cycle deterioration than the batteries of Comparative Examples. In particular, the cycle deterioration from the 100th cycle to the 500th cycle is as follows. It is extremely smaller than the battery of the comparative example.
【００４４】[0044]
【発明の効果】以上のように、この発明に係る非水電解
質二次電池は上記の様に構成されているため、全体が均
一で効率のよい充放電が行われるようになり、電池の単
位充放電容量を大きくすることができる。また、負極リ
ードの取り付け位置から遠ざかるに従い負極活物質層の
厚みが薄くなるようになった負極板および正極板におけ
る厚みの薄い方が渦巻き状の円心側に位置するようにす
ることにより、ひび割れや、正極板または負極板とセパ
レータの密着が不均一になることを防止できるようにな
り、その結果、電池の異常反応を防止し、サイクル劣化
を防止することができるようになる。As described above, the non-aqueous electrolyte secondary battery according to the present invention is configured as described above, so that the whole is uniformly and efficiently charged and discharged, and the unit of the battery is improved. The charge / discharge capacity can be increased. In addition, the thickness of the negative electrode plate and the thickness of the negative electrode active material layer become thinner as the distance from the mounting position of the negative electrode lead increases, so that the thinner one of the negative electrode plate and the positive electrode plate is located on the spiral center of the spiral, so that cracks are formed. In addition, it becomes possible to prevent uneven contact between the positive electrode plate or the negative electrode plate and the separator. As a result, abnormal reaction of the battery can be prevented, and cycle deterioration can be prevented.
【図１】この発明の一例による非水電解質二次電池を示
す断面図。FIG. 1 is a sectional view showing a non-aqueous electrolyte secondary battery according to an example of the present invention.
【図２】図１のＡ−Ａ断面図。FIG. 2 is a sectional view taken along line AA of FIG.
【図３】（ａ）は正極板を延ばした状態の正面図、
（ｂ）はその平面図。FIG. 3A is a front view of a state where a positive electrode plate is extended,
(B) is a plan view thereof.
【図４】（ａ）は負極板を延ばした状態の正面図、
（ｂ）はその平面図。FIG. 4A is a front view of a state where a negative electrode plate is extended.
(B) is a plan view thereof.
【図５】従来例による非水電解質二次電池の断面図。FIG. 5 is a cross-sectional view of a conventional nonaqueous electrolyte secondary battery.
１０・・・・・・非水電解質二次電池 １１・・・・・・正極板 １２・・・・・・正極集電体 １３・・・・・・正極活物質層 １４・・・・・・正極リード １５・・・・・・負極板 １６・・・・・・負極集電体 １７・・・・・・負極活物質層 １８・・・・・・負極リード １９ａ，１９ｂ・セパレータ ２０・・・・・・電極 ２１・・・・・・負極缶 ２３・・・・・・キャップ 10 Non-aqueous electrolyte secondary battery 11 Positive electrode plate 12 Positive electrode current collector 13 Positive electrode active material layer 14 -Positive electrode lead 15-Negative electrode plate 16-Negative electrode current collector 17-Negative electrode active material layer 18-Negative electrode leads 19a, 19b-Separator 20- ····· Electrode 21 ···· Anode can 23 ···· Cap
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 5H014 AA02 AA06 BB00 CC07 EE01 HH00 5H028 AA05 BB07 CC08 CC10 CC13 HH06 5H029 AJ03 AJ05 AK03 AL07 AM03 AM05 AM07 BJ02 BJ14 CJ01 CJ07 CJ22 DJ02 DJ04 DJ05 DJ07 HJ04 HJ12 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)
Claims (3)
形成した正極板と帯状の負極集電体の両面に負極活物質
層を形成した負極板の間にそれぞれセパレータを挟んだ
状態で渦巻き状に巻回して電極を形成し、この電極を缶
内に装填し、上記正極板から正極リードを、上記負極板
から負極リードを、それぞれ上記缶の外表面に連通する
ように延設した非水電解質二次電池であって、少なくと
も、上記正極板の正極活物質層の厚みが、正極リードの
取り付け位置から遠ざかるに従い薄くなるようにした非
水電解質二次電池。1. A separator in which a separator is interposed between a positive electrode plate having a positive electrode active material layer formed on both sides of a strip-shaped positive electrode current collector and a negative electrode plate having negative electrode active material layers formed on both sides of a strip-shaped negative electrode current collector. A spirally wound electrode was formed, the electrode was loaded in a can, and a positive electrode lead was extended from the positive electrode plate, and a negative electrode lead was extended from the negative electrode plate so as to communicate with the outer surface of the can. A non-aqueous electrolyte secondary battery, wherein at least the thickness of the positive electrode active material layer of the positive electrode plate becomes thinner as the distance from the mounting position of the positive electrode lead decreases.
ドの取り付け位置から遠ざかるに従い薄くなるようにし
た請求項１に記載の非水電解質二次電池。2. The non-aqueous electrolyte secondary battery according to claim 1, wherein the thickness of the negative electrode active material layer of the negative electrode plate decreases as the distance from the mounting position of the negative electrode lead increases.
巻き状の円心側に位置するようにした請求項１または２
に記載の非水電解質二次電池。3. The positive electrode plate according to claim 1, wherein the thinner positive electrode active material layer of the positive electrode plate is located closer to the spiral center.
The non-aqueous electrolyte secondary battery according to 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18788798A JP4205209B2 (en) | 1998-07-02 | 1998-07-02 | Nonaqueous electrolyte secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18788798A JP4205209B2 (en) | 1998-07-02 | 1998-07-02 | Nonaqueous electrolyte secondary battery |
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| Publication Number | Publication Date |
|---|---|
| JP2000021453A true JP2000021453A (en) | 2000-01-21 |
| JP4205209B2 JP4205209B2 (en) | 2009-01-07 |
Family
ID=16213939
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|---|---|---|---|
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| JP2007188806A (en) * | 2006-01-16 | 2007-07-26 | Matsushita Electric Ind Co Ltd | Nonaqueous electrolyte secondary battery |
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